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| Keywords: Manometers used in testing air speed meters.jpg This photograph shows two of the manometers used in testing air speed meters Shown are the Water V Tube used for calibration and the mercury V tube used for excess pressure tests for Zalun-type instruments Two manometers have since been installed at NBS a single tube manometer for Pitot instruments and another for Zalun-type instruments National Institute of Standards and Technology National Institute of Standards and Technology The images in the Aeronautical Instruments Photographic Collection are in the public domain and are not subject to copyright in the United States However please pay special attention to the individual works to make sure there are no copyright restrictions indicated Individual works may require securing other permissions from the original copyright holder Use of the images from NIST Digital Collections is not restricted but a statement of attribution is required Please use the following attribution statement National Institute of Standards and Technology Digital Collections Gaithersburg MD 20899 PD-USGov National Bureau of Standards National Institute of Standards and Technology Aerospace engineering Aeronautical measurement | ||||
